Avast Free Isolates Files Being Installed

Hi

I need a little help please.

I am using Avast Free 7.0.1466 on Windows XP and when I install a file (driver files for example) a pop up says that it is being isolated and do I want to continue isolation. When I say no the installation fails.

I switched off the shields but same thing happened. The sandbox is not activated.

Can anyone suggest what is happening and why and how to stop it?

Thanks

Terry

Can you post a screenshot of that message?